age = int(input("请输入购票者的年龄："))
price = 100
half_price = price / 2
if age <= 4:
    print("四岁以下免费")
elif age > 4 and age <=12:
    print("十二岁以下半价,票价为：",half_price)
elif age >= 60:
    print("六十岁以上半价,票价为：", half_price)
else:
    print("价格为：",price)